Aperture Tag: The Paint Gun Testing Initiative is a Portal 2 Mod. It's time to think with Gels! The Portal-Gun is gone, but the testing must go on! Grab the Paint-Gun Device and solve brand new test chambers in ways you've never solved them before!
User reviews: Mostly Positive (1,595 reviews) - 76% of the 1,595 user reviews for this game are positive.
Release Date: Jul 15, 2014

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Community-Made Mod

This community-made mod requires that you have Portal 2 installed prior to running this game.

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Aperture Tag: The Paint Gun Testing Initiative


Recommended By Curators

"Aperture Tag: The Paint Gun Testing Initiative is a Portal 2 Mod but for money"
Read the full review here.


“If you're like me, when you played Portal 2, you covered every room in as much bouncy gel as possible. Well now it's a whole lot easier, and you can color coordinate the walls with orange gel.”

“A surprising and fresh revival of Portal 2’s familiar puzzle elements.”
Jeep Barnett

“It looks great, it plays well, and it lasts 2-3 hours, giving it good value for money.”

Steam Greenlight

About This Game

Aperture Tag: The Paint Gun Testing Initiative is a community-made mod for Portal 2, inspired by TAG! The Power of Paint. The familiar Portal 2 gels are now contained within the Aperture Science Paint Gun Device and it's your job to test it out!

Featuring a new personality-core and an original story with 27 polished levels; the mod offers an exciting and fun experience in varied and interesting new locations throughout Aperture Science.

Introducing gels as the core gameplay mechanic completely changes the way you solve puzzles, explore, and survive all the challenges thrown at you!

Key Features

  • New Gameplay Mechanics for Portal 2
  • 27 Original Maps and a Full Campaign
  • A New Character with Original Voice-Acting
  • In-Game Level Editor
  • Access to the Source Files used to create the Aperture Tag
  • Single-Player and Co-op Workshop Integration with Source Instances to create your own Paint Gun Maps
  • Steam Trading Cards
  • Full Developer Commentary
  • Completely original Soundtrack by Abarax, Harry101UK, and Christopher McEvoy

System Requirements

Mac OS X
    • OS: Windows 7 / Vista / XP
    • Processor: 3.0 GHz P4, Dual Core 2.0 (or higher) or AMD64X2 (or higher)
    • Memory: 1GB XP / 2 Vista GB RAM
    • Graphics: Video card must be 128 MB or more and should be a DirectX 9-compatible with support for Pixel Shader 2.0b (ATI Radeon X800 or higher / NVIDIA GeForce 7600 or higher / Intel HD Graphics 2000 or higher).
    • Hard Drive: 4 GB available space
    • Additional Notes: Requires a Steam version of Portal 2 Installed
    • OS: MAC OS X 10.6.7 or higher
    • Processor: Intel Core Duo Processor (2GHz or better)
    • Memory: 2 GB RAM
    • Graphics: ATI Radeon 2400 or higher / NVIDIA 8600M or higher / Intel HD Graphics 3000
    • Hard Drive: 4 GB available space
    • Additional Notes: Requires a Steam version of Portal 2 Installed
Helpful customer reviews
54 of 83 people (65%) found this review helpful
1 person found this review funny
1.1 hrs on record
Posted: August 2
It's an insult to charge money for this mod, when larger, infinitely better mods (Portal Stories: Mel) are available for free. Further more, I found this mod frustrating more than anything else. On the last puzzle I tried I had to try a jump about 30 times before finally making it. I've played about a hundred different community levels for Portal 2, so I know my way around the game. When a puzzle is so finely tuned to doing an action within a few milliseconds in order to succeed, I find it more frustrating than fun. This mod was just frustration upon frustration, without a single element of actual fun. It's definitely not worth the money, and it became the first game I've actually requested a refund for.
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21 of 28 people (75%) found this review helpful
1 person found this review funny
4.5 hrs on record
Posted: July 21
Nigel sounds like one of those 14 year old let's play youtubers.
Other than that, it's great.
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35 of 55 people (64%) found this review helpful
1 person found this review funny
19.3 hrs on record
Posted: April 27
I've bin holding off on reviewing this mod for a long time, mostly cause someone bought it for me and said they wanted a positive review on it because of that. I told him I'd give an honest one, what I truly think of the game, but let me tell you right now, even though I don't recommend the game, doesn't mean its utter garbage.

Mod Base/Core Idea: The creator of this mod had a great idea, the gel gun, completely new testing element, never bin used with this game before. Although on the outset, I thought I was going to have control of not only a gel gun, but a portal gun as well which would have bin awesome, when I found out I wasn't, it was a huge bummer. None the less the idea of gels as the core testing element and virtually having full control of it (with the exception of having to account for gravity as the gel does come out in a straight line, but rather an arc) is a great idea and they should be commended for that. And although it could still use a little work, the idea is there, so for that it gets a 9/10.

Puzzles: It has some pretty good puzzles, but only like 5 in the entire game that I really think are great, the rest are kind of meh, they lack the fullness that the Portal and Portal 2 levels have. Now I'll admit it's not easy creating a puzzle where the main and sometimes only testing element is gel; none the less, most of them just weren't that great. They included auto portals in some tests that you controlled in various ways, but they only contributed slightly to the tests. I will say that some of the ways that they made some areas "non-gelable" were interesting, but it doesn't make up for what the puzzles are lacking in. Overall for puzzles, left much to be desired. 3.5/10 (Oh yeah, and generally, this game can be spedran in about 24 minutes, and exploits and unintended solutions abound, even if you aren't a speedrunner..boooo!)

Aesthetics: One word, shoddy. It's like the ppl that made it knew some stuff in hammer, but not that much, and certainly not enough to make a full mod out of (especially that they charge for). One of my friends (who did NOT work on this mod, but should have cause he's a hammer god) even said "We do not talk about the poor mapping practices of Aperture Tag." Of course I laughed, but because its true; if the ppl that made this mod knew half of what they should have bin doing, it might actually look good. The way it is now, very basic and like they wanted to give off the appearance of being hammer guru's, without actually putting the necessary work into it; well guess what guys, you failed. Now I'm not saying none of them knew what they were doing, I know Mevious worked on it (and most of his stuff is really good), as well as at least 2 others, but the rest of them need to go to hammer school, BAD. Overall, the aesthetics probably leave more to be desired than the puzzles, though they are a start, they should not be in a full mod, especially one that isn't free. There is also quite a bit of nodraw (a type of invisible wall) that you can see without too much effort, and its something that shouldn't ever be seen. Exhibit A of what i give it a 2/10 for aesthetics.

Music: Absolutely the best part of this mod! I've listened to the soundtrack on YouTube probably twice as long in hours and minutes then I've played the mod itself (if not more), honestly, I'd pay 7 or maybe even 10 dollars for the music by itself. The game? That's another story. I didn't love all the songs at first, but as I've listened to them they grew on me and now I love them all, so the music alone gets a 10/10. (In-game it's actually not really all that great cause you don't hear it everywhere like in portal, and it's kind of stuck in the background as a result, so use of music gets a 6/10)

Overall: It didn't do too well for me, whether i payed for it myself or not, it wasn't worth $7, I wouldn't even say it's worth $5 actually, 2-3 dollars is an ok price to pay for this one. So my suggestion to you after reading this if you are still interested in this mod (you're amazing for reading this far btw :p), wait for a sale that its less than $3, that way you wont feel like you've wasted your money.

Final Thoughts: It has workshop support, but the coop is the most irritating (it could be good, but its hit and miss to make the gel appear, even when its enabled; also, the person holding the gel gun is placing portals, and the one with the gels is holding nothing; that's just terrible, it also doesn't have a coop story mode), and the sp, well its pretty much the same story as the Portal 2 workshop, but there's not really much they can do about that.
The average of the 4 places i reviewed here is about 7/10, although I'd probably just give it a 4/10 for little details and nitpicks that aren't worth mentioning here that are also lacking in this mod. If you still think you're interested in it after all of this, you either don't know much about those little details, or you don't care, which is completely your deal. But now you know why I don't recommend buying this game, at full price at least.
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7 of 9 people (78%) found this review helpful
1 person found this review funny
8.2 hrs on record
Posted: July 15
I like that I get to use the gels in this mod. It's a nice change from portals :P.

A lot of people say this mod isn't good or worth buying but I think it is. You get to use gels instead of portals to solve puzzles or just paint the rooms different colors.

Solve puzzles with your Co-op partner or send them flying while they're afk :P. Sadly there is no Co-op story mod just singleplayer. But you can do Co-op with chambers that other players made.

I rate this Mod 8/10.
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2 of 2 people (100%) found this review helpful
9.5 hrs on record
Posted: September 8
This is a great game. Instead of firing Portals, you use a blue and orange gel gun. To pregress around the chambers. Some chambers are challenging for Novice players. But once you worked out how to solve the chambers. You will feel the accomplishment feeling of success.

It would also be great if there were achievements added to achieve please?
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